Trailer chassis

ABSTRACT

A multiple functional land trailer is provided which is adapted to receive, center and immovably hold material-receiving containers such as, shipping containers for bulk material, transporting means for animals, coach-type living or camping structures, or a plurality of material-receiving modular units and the like.

United States Patent Walsh et al.

[54] TRAILER CHASSIS [72] Inventors: David P. Walsh; Joanne M. Walsh,

both of 1400 Ramsey Drive, Edgewater, Md. 21037 22 Filed: 0ct.3l,1969

21 Appl.No.: 873,001

[52] US. Cl ..214/517, 296/10, 296/35 A [51] Int. Cl. ..B60p l/64 [58]Field of Search ..214/517, 515; 296/35, 35 A,

296/28 M, 1 R, 10; 220/l.5; 105/366 B, 366

[56] References Cited UNITED STATES PATENTS 1,521,156 12/1924 Jenkins..296/35 A UX 3,119,503 1/1964 l-lerpich ..296/35 A X [451 Nov. 21, 19722,846,264 8/1958 LOOmiS ..296/35 A 495,658 4/1893 Bernstein ..296/57 UX3,266,836 8/1966 Taylor et al. ..296/10 3,332,601 7/1967 Hand ..214/515X Primary Examiner-Benjamin Hersh Assistant Examiner-John A. PekarAttorneyE. Barron Batchelder [57] ABSTRACT 11 Claims, 24 Drawing FiguresPATENTED W21 I972 SHEET U10F1O PAIENIEnmm 1972 SHEET on [1F 10PATENTEDIHVZI m 3.703.244 SHEET 08 [IF 10 PATENTED W21 I972 SHEET OSUF1O PATENTED NM 2 I I972 SHEET lOUF 1O Q Q s:

OON

mumL TRAILER CHASSIS The present invention relates to a trailer chassisunit comprising conventional means for attachment to an automotivevehicle, and more particularly to the interchangeable units adapted tobe secured to the trailer chassis. These modular units may take the formof a van type unit so constructed to permit the safe and protectedtransportation of storageable materials from one place to another.Another type of modular unit may be of the camper type or self-containedtype unit for recreational or housing facilities. Still another type ofmodular unit may be in the form of a unit for conveying horses orlivestock. Still further units could be of the type for the landconveyance of a boat or open type of bed similar to the open bed of atruck. A commercial type of shipping container may also be employedwherein articles may be placed within a container for shipping purposesand then sealed by the shipper and conveyed to a terminal point wherethe sealed container is removed from the chassis and placed on the flatbed of a large tractor trailer adapted to receive a plurality ofcontainers and safely transported to its destination with minimalhandling procedures and economical shipping costs. An alternative isoffered if the user of such a container so desires, he may transport itby use of a chassis adapted to receive and secure the container.

The problem existant in the conventional types of trailers presently onthe market, is that the chassis for each type forms an integral part ofthe trailer and as a consequence, imposes impracticalities on the owner,due to the simple fact that he must license and maintain the vehicle,(i.e., the chassis), regardless of the need for the particular body thatis fixidly secured thereto. Referring now to the drawings:

FIG. 1 is a side elevational view of the chassis having a van type ofunit secured thereto.

FIG. 2 is a rear elevational view of FIG. 1.

FIG. 3 is similar to FIG. 1 showing the detachable unit removed from thechassis.

FIG. 4 is a top plan view of the chassis.

FIG. 5 is an enlarged detailed fragmentary sectional view taken alongthe line 5-5 of FIG. 4 and showing structural details of the chassisunit and the modular unit retainer means.

FIG. 6 is an enlarged detailed transverse fragmentary sectional viewtaken along the line 66 of FIG. 1 showing the cooperative engagementbetween the chassis and modular unit.

FIG. 7 is a longitudinal detailed fragmentary sectional view taken alongthe line 77 of FIG. 6 illustrating the cooperative engagement betweenthe chassis and modular unit along with means for retaining securedengagement of the two components.

FIG. 8 is a detailed fragmentary sectional view of the right hand end ofFIG. 7 showing the modular unit frame portion in a partially retractedposition from the chassis with the retainer means swung to theout-of-theway position.

FIG. 9 is a side elevational view of the components of FIG. 8 showingthe modular unit as being properly positioned with the chassis retainermeans in place in dotted line and the locking means secured.

FIG. 10 is a perspective view of the van type of modular unit.

FIG. 11 is an enlarged fragmentary transverse sectional view taken alongthe line 11-l1 of FIG. 10 showing the detailed structure of the lowerportion of the unit.

FIG. 12 is a detailed fragmentary longitudinal sectional view takenalong the line 12-12 of FIG. 11 and shows the apertured portion of thelower structural detail of a modular unit adapted to receive thesecuring means of the chassis.

FIG. 13 is a side elevational view showing a camper type modular unitalong with its disengageable self-supporting means while not formingpart of the chassis and further illustrates the position of the chassisin phantom line when in engagement position with the modular unit.

FIG. 14 is a side elevational view similar to FIG. 13 and shows a variedtype of modular unit for the conveyance of livestock, such as horses.

FIG. 15 is a side elevational view showing a modular unit adapted forthe land conveyance of a boat.

FIG. 16 is a side elevational view showing a still further modified typeof modular unit adapted for the use of open bed truck type hauling.

FIG. 17 is a side elevational view of a modified form of chassis andcontainer adapted for commercial use.

FIG. 18 is an enlarged detailed fragmentary sectional view taken alongthe line 18-l8 of FIG. 17 which shows modified structural detail.

FIG. 19 is a still further enlarged sectional view taken along the line19-19 of FIG. 17.

FIG. 20 is an enlarged fragmentary sectional view of the lower left handportion of the modified chassis and container shown in FIG. 17 andillustrates a removable retainer for the easy removal of the commercialtype of container.

FIG. 21 is a perspective view of the container unit shown in FIG. 17 asbeing removed from the chassis.

FIG. 22 is a side elevational view of the container unit shown in FIG.21 and illustrates the manner in which a plurality of containers can bestacked in superimposed relationship as shown in phantom line.

FIG. 23 is a side elevational view of a plurality of stacked containersas resting on the flat bed of a large interstate type of tractor trailertruck for transporting the containers to varying destinations.

FIG. 24 is a rear elevational view of the truck shown in FIG. 23 and amethod for easy removal for place ment of the container units shown inFIG. 10.

In the drawings, reference numeral 10 generally indicates a trailerchassis adapted to receive varying types of modular body units generallyreferred to by reference numerals 12, 12a, 12b, 12c, and 12d. As may beseen in FIGS. 1, 2 and 3 the modular units 12, are readily detachablefrom the chassis 10 and are adapted to be supported by means ofretractable legs which retain the unit in an upright spaced conditionfrom the ground which permits the use of the modular unit once it hasbeen put in place and relieves the movable chassis for employment withany of the other types of modular units which are each interchangeablewith the other whether it be a camper type unit as indicated at 12a orany of the other units previously described.

Referring now more particularly to the chassis 10 as seen in FIGS. 1, 2,3, 4, 6, and 7, the vehicle comprises a generally rectangular framestructure having longitudinal side rails 14 and transverse forward andrearward end frame members 16 and 18. A conventional type of trailertongue is provided by the forwardly and medially extending channel ironmembers 20 which terminate and are fixedly secured to a conventionalsocket-type of trailer hitch as indicated by the reference numeral 22.The trailer tongue is provided with a conventional type of retractablesupport wheel 24 approximate and adjacent to the ball hitch 22, thepurpose of which is to form a support means for the forward portion ofthe chassis when in a detached condition. A winch 26 is providedrearwardly and adjacent the support wheel 24, the function of which willbe hereinafter described. The trailer bed comprising the side rails 14and transverse end members 16 and 18 which form the loadbearingsurfaces, is supported by tandem-type type wheels 30, the axles of whichare suitably journaled in bearings 32 fixedly secured by means'ofwelding or bolts to the undersides of the side rails 14. The trailer bedside. rails 14 are provided on their outer faces with side plates 40fixedly secured thereto. These side plates 40 are of a greater heightthan the frame members 14 and the upper extending inner faces of theseside plates 40 provide a keeper or retaining means for the lower framestructure 76 of the modular units 12. The transverse forward end framemember 16 comprises a vertical web section 42, the height of which isequal to the height of the side plate portions 40, and is welded to thelongitudinal side rail frame members 14 and side plates 40. The forwardend frame member 16 comprising the web portion 42 has oppositelyextending flanges 44 and 46 to add structural rigidity to the chassisbed. The transverse connecting rear end frame member 18 is of the sameheight as the longitudinal side rail frame members 14 and is welded atits ends to each of these members.

From the foregoing, it will be seen that the chassis bed section, whileof rectangular configuration, has by means of the vertically extendedside plates 40 and coextensive web 42 of the forward transverse endframe member 16 formed a u-shaped receptacle with the longitudinal siderail frame members 14 being provided with skid plates on their uppersurfaces, as supporting means for the sliding insertion of a modularunit, the structure of which will be hereinafter described. Theco-extensive web surface 42 forms an abuttment face for the forwardportion of the modular unit while the side plates 40 prevent lateralmovement. The extended web portion 42 of the forward transverse endframe member 16 is provided with modular retainer lugs 50 the functionof which will be hereinafter described. The retainer lugs 50, have alower horizontal surface while its upper and end surfaces are of angularconfiguration so as to provide camming surfaces for proper orientationand insertion into the frame structure of the modular units 12. The reartransverse end frame member 18 of the chassis frame has welded thereto apair of hinge portions 56, to its outer face and pivotally fixed to aplate 58 as at 59 and the plate 58 is co-planer withthe side plates 40when in the raised position. The hinged plate 58 in its raised positionforms an end closure means for the previously described u-shapedreceptacle. A pair of retainer lugs 60, similar to those previouslydescribed by the reference numeral 50 are welded to the inner face ofthe hinged plate 58 and serve the same purpose for the opposite end ofthe modular unit. A pair of hinged elements 62 are welded to the ends ofthe plate 58 and form locking means to retain the plate 58 in a verticalposition, the function of which is more clearly defined in FIGS. 4, 5, 8and 9. The hinged elements 62 are secured in a suitable manner such as akeeper pin 64 (FIG. 9).

As viewed in FIGS. 4 and 5, a telescopic boom having a fixed portionsecured to the transverse chassis endframe members 16 and 18 andpositioned beneath the trailer chassis and having an extensible boom 72in sliding engagement with the inner faces of the fixed tubular member70, has at one end thereof, a rotatable pulley 74 secured thereto and ispositioned medially of the chassis bed, the purpose of which will behereinafter described.

Referring now more particularly to FIGS. 10, 11 and 12, the modular vantype of unit, generally indicated by the reference numeral 12, comprisesa rectangular base frame structure, generally indicatedby the referencenumeral 76, having longitudinal side members and transverse end members82. The longitudinal side frame members 80 are welded or appropriatelysecured to the end frame members 82, which form a rectangular framestructure 76 adapted to support appropriate box-like van type unitshaving side panels 84, an end panel 86, a roof closure 88 and accessdoors )0 at the opposite end of the panel 86. The transverse end frameportions 82 are apertured at 92 for a purpose to be described. A pair ofskid plates 96 are appropriately secured to the bottom portions of thelongitudinal frame members 80.

From the foregoing, it will be understood that the rectangular baseframe structure 76 of the modular unit 12 is adapted to be received innested relationship with the u-shaped opening of the chassis frame andis secured thereto by means of engagement of the apertured openings 92in the forward transverse frame member 82 with the retainer lugs 50,which form a fixed part of the chassis frame. Once in place and properlypositioned by means of the previously described nesting qualities of thechassis and modular unit, the previously described pivotal end plate 58is rotated into the position seen in FIG. 7 with the retainer lugs 60entering the apertured openings 92 of the rear transverse frame member82 thereby closing the u-shaped opening of the chassis by means of theplate 58 and locking themodular unit 12 in place against vertical orrearward movement by retainer lugs 60 and plate 58.

Collapsible supporting legs 100, pivotally mounted as at 102, to thelongitudinal base frame members 80 of the modular unit 12, form asupport means for the unit and are rotated to an out-of-the-way positionwhen the unit 12 is in nested relationship with the chassis 10. Au-shaped eye 104 is fixedly secured to each transverse frame member 82of the modular unit 12 and is adapted to receive the hook on the cableend of the winch 2 6. The chassis 10 is positioned to receive themodular unit 12, more particularly seen in FIG. 3, and the cable of thewinch 26 is withdrawn so as to permit the hook thereon to secure the eye104 on the forward end of the modular unit and as the winch cable isretracted, the modular unit 12 is brought into nested relationship withthe chassis and locked thereto as described above.

To remove the unit from the chassis, the previously described extensibleboom 72 is extended and the winch cable is passed beneath the chassisand trained around the pulley 74 of the extensible boom and the hook atthe cable end secured to the eye 104 on the rear of the modular unitand, once again, as the cable is withdrawn, the modular unit and chassisare separated and the pivotal supporting legs 100 rotate into positionto again form support means for the unit.

FIG. 13 shows a modified modular unit generally designated by thereference numeral 12a, which constitutes a camper or trailer home typefacility, comprising sleeping, cooking, storage and toilet facilities,conventionally employed in the mobile home type of trailer. The unit 12arests upon the identical rectangular frame structure 76 employed inFIGS. 11 and 12 and is adapted to be received by the chassis shown inphantom line, in a similar manner. The forward portion of the unitoverhangs and is supported by the chassis tongue structure previouslydescribed.

FIG. 14 illustrates another modular unit and is designated generally bythe reference numeral 12b, comprising the conventional facility for theconveyance of livestock, such as horses. This unit is fixedly secured toan identical subframe structure 76 as the previous units described andadapted to be received, contained and removed in a similar manner.

FIG. 15 illustrates a further modified modular unit adapted to support aboat for land conveyance. The same type of modular subframe construction76 is employed comprising the longitudinal side frame members 80 andtransverse end frame members 82 with pivotal supporting legs 100. Thelongitudinal side frame members 80 are provided with transverserotatably supporting rollers 110, the function of which is to supportthe hull of a boat indicated in phantom line by the reference numeral112 and is supported at its bow by means of a snub roller 114 rotatablyjournaled in a standard 116, which is in turn welded or otherwisesecured to an outrigger frame 118 forming a part of the modular baseframe structure 76 and is supported by the members of the tonguestructure of the chassis which is indicated in phantom line by thereference numeral 10. The stem of the boat is supported by means ofoutrigger skid pads 120 which are pivotally mounted as at 122, to thelongitudinal side frame members 80 of the modular base frame structure76.

FIG. 16 illustrates still another modified modular unit generallyindicated by the reference numeral 12d and comprises an open bed type ofunit 124 for general hauling purposes and has removable side and endextenstion units 126. The open bed unit is fixedly secured to thepreviously described modular subframe structure 76 and is adapted to bereceived, contained and removed in a similar manner in cooperation withthe chassis unit shown in phantom line and indicated by the referencenumeral 10.

A modified form of chassis and modular container is shown in FIGS. 17through 22 and illustrates structures which could be employed forcommercial use, the function and purpose of which is hereinafterdescribed. The modified chassis is generally indicated by the referencenumeral 150 comprising a main frame construction indicated by thereference numeral 152 comprising longitudinal rails 154 and forwardtransverse end frame members 156 and rearward transverse end framemembers 158. The forward transverse end frame member 156 as viewed inFIGS. 17 through 20, has secured to its outer face similar tongueelements as described in the previous FIGS. In this form of chassis, asingle axle conveying means is shown indicated by the reference numeral160, appropriately journaled in bearings 162 suitably mounted on theunderside of the longitudinal rail frame members 154. The axles havewheels 164 rotatably journaled and are provided with suitable springsupport. The longitudinal rail frame members 154 are of L-shapedconfiguration and its inner surfaces are polished so as to receive,support and contain a removable unit. The lower horizontal inturnedflanges of the L-shaped longitudinal rail frame members 154, form thesupport means for the removable container, while the upstanding flanges172 of the L-shaped longitudinal rail frame members 154 form a retainingmeans for the container unit. The forward transverse end frame member156, more clearly seen in FIG. 20 has an inwardly turned flange supportmember 174 which is co-planer with the support flanges 170 of thelongitudinal rail frame members 154. A vertical web portion 176 of theforward transverse end frame member 156 forms an abuttment face andretainer means for the modular container unit to be inserted andhereinafter described. The vertical web portion 176 is apertured as at178 to permit passage of a removable retainer lug 180 which is welded orotherwise secured to a transverse hinge plate 182. The fixed hinge plate184 is welded to the underside flange support 174 of the forwardtransverse end frame member 156. The function of the removable retainerlug 180 will be hereinafter described. As seen in FIG. 17, thelongitudinal rail frame members 154 are notched out as at 186 in orderto expose and provide access for the lower frame structure of themodular container hereinafter described. The previously describedrearward transverse end frame member 158 is welded at its terminal endsto the longitudinal side members 154 and provides a pivot 59 on itsrearrnost edge as viewed in FIG. 17 which carries a hinge closure plate58 and retainer lugs 60 welded thereto, along with hinged locking plates62 positioned on the terminal ends of the pivotal plate 58. Thisapparatus is similar to the previously described apparatus as viewed inFIG. 5.

Continuing with reference to FIGS. 17 through 22 a modular containergenerally referred to by the reference numeral 200, comprises lowerlongitudinal rail frame members 202 and lower transverse end framemembers 204 of L-shaped configuration adapted to be joined at their endsto appropriate corner castings 206 of rigid construction. Thelongitudinal frame members 202, transverse frame members 204 and cornercastings 206 constitute a base frame, generally designated by thereference numeral 205, of suitable dimensions to be received in slidingengagement with the chassis frame 150 and secured thereto in nestedrelationship. Vertical upright corner supports 208 are securely fixed tothe comer castings 206 and extend upwardly to support an upper framestructure comprising corner castings 210, upper longitudinal side rails212 and transverse end rails 214. The lower frame structure with thevertical corner support and upper frame structure form a box-like frameand has for its closure means, side panels 216, floor and roof panels218, end closure panel 220 and removable or hinged panels at itsopposite end, which which provides access to the container for thestorage of transportable materials. The lower frame 205 of the unit haselongated openings 222 provided in the longitudinal rail frame members202 and the transverse end frame members 204, the function of which willbe hereinafter described. The lower frame corner casting members 206 areapertured on their underside at 224 (FIG. 22) and the upper frame cornercastings 210 have conical dowels 226 on their upper faces. Theaperatured lower corner castings 206 and the upper doweled cornercastings 210 provide a means for positioning and stacking the units 200in superimposed relationship as seen in FIG. 22.

From the foregoing, it will be understood that the previously describedchassis 150 is adapted to receive a modular container unit 200 in nestedand secured relationship. The removable unit 200 provides a storage andshipping container, which may be lifted onto the chassis by means of afork lift truck, the prongs of which enter the openings 222 provided inthe lower longitudinal or transverse frame members 202 or 204 andposition the unit into position from either side or the rear of thechassis whose retainer lugs 60 and 180 have been moved to anout-of-the-way position. Once the container is in place and nestedwithin the framework of the chassis, the prongs of the fork lift truckare withdrawn and the previously mentioned retainer lugs 60 are rotatedinto engagement with the transverse end frame members 204 through theapertures 222 as more clearly seen in FIGS. 17 and 20, thereby fixedlysecuring the container against any movement and for all intents andpurposes making the unit 200 and the chassis 150 an integral component.The removal of the container 200 is achieved by reversing the procedure,that is, by rotating the retainer lugs 60 to an out-of-the-way positionand once again bringing a fork lift vehicle into operation, insertingthe prongs of the fork lift into the apertures 222 of the containerframe and removing it to its desired location.

Referring now more particularly to FIGS. 23 and 24, a conventionaltractor type truck, generally indicated by the reference numeral 250having a fifth wheel assembly and in cooperation with a conventionalflat bed trailer generally indicated by the reference numeral 252 isshown as a means for transporting a plurality of the previouslydescribed container units 200 in stacked relationship as shown or thepreviously described modular van type of unit 12 previously described.It will be readily understood that available trucking facilities offer asatisfactory method for shipping and transporting the containers or vantype modular units to varying destinations which upon arrival need onlybe unloaded by means of a fork lift truck shown in FIG. 24, which thencan be unloaded at a terminal or individually delivered directly to theconsumer by means of employing a previously described chassis unit. Thecontainers, therefore, offer an economical and practical method oftransporting goods or merchandise from manufacturer to consumer, or ameans for an owner to fill and secure a container with his householdgoods and depositing the container at a terminal point whereconventional and knowledgeable existing trucking facilities may deliverthe container to a remote destination at a very low cost, while theowner of the stored materials is assured of the safe and protectedconveyance of his articles at an economical rate having eliminated agreat deal of handling.

I claim:

1. A multiple functional land trailer comprising:

A. a main trailer chassis frame;

B. a rigid, self-supporting trailer body supporting frame removablymounted on said main chassis frame;

C. said main trailer chassis frame including:

i. upstanding front and side walls defining an upwardly open trailerbody supporting frame receiving bed;

D. said trailer body supporting frame and said receiving bed of saidmain trailer chassis frame respectively having shapes and dimensions tointerengage in mating nested relationship and with said receiving bedengaging and supporting said trailer body supporting frame inco-extensive intimate frameto-frame supporting engagement therewith; and

E. engaging and centering means on said chassis frame and said trailerbody supporting frame for interengaging and securing said trailer bodysupporting frame to said receiving bed in an integrated and interlockedrelationship as a substantially unitized composite structure of combinedstructural support and rigidity.

2. The invention defined in claim 1 including a telescopic boom carriedby the main frame and adapted to extend rearwardly of the rear end ofsaid trailer, winch means secured to the forward end of said trailer andflexible draft means cooperating with the removable container and saidboom for urging the container from the trailer chassis.

3. The invention defined in claim 2 including a pulley mounted at therearward end of said boom.

4. The invention defined in claim 1 including container removalfacilitating means operatively carried by the main frame and selectivelyattachable to the removable container, said means being operable forurging the container from the trailer chassis.

5. A multiple functional land trailer as claimed in claim 1, includingsupport legs pivotally connected to each trailer body frame, saidsupport legs being retractable and extensible, said support legs beingretractable and securable within the confines of said trailer body framein a manner to prevent interference between the respective frames.

6. A multiple functional land trailer comprising:

A. a wheeled chassis;

B. a trailer body;

C. said chassis including a generally quadrangular main frame andupstanding front and side walls defining a trailer body receiving bed toreceive a rigid removable trailer body;

D. said trailer body having a frame of size and shape corresponding tosaid trailer body receiving bed and removably nested and mating therein;

B. said trailer body frame having apertures in at least one end wallthereof;

F. engaging and centering cam members secured to an end wall of saidtrailer body receiving bed and engageable in said apertures, said cammembers and said apertures coacting for securing said trailer body insaid trailer body receiving bed and interengaging and securing saidframes in an integrated and interlocked relationship as a substantiallyunitized composite structure of combined structural support andrigidity.

7. A multiple functional land trailer as claimed in claim 6, wherein thesecuring means include at least one trailer body engaging and centeringcam member secured to said front wall and projecting generallyrearwardly, a rearwardly foldable upstanding rear wall on said chassis,at least one cam member carried by said rear wall, said trailer bodyhaving a mating rear opening in the frame thereof, said latter cammember being engageable in said latter opening when said rear wall is 10in an upstanding position.

8. The trailer defined in claim 7 wherein said rear wall is hinged tothe main frame along its lateral rear edge and lock means securing saidrear wall to each of said upstanding side walls.

9. The invention defined in claim 8 wherein said lock means includes apair of arm members hinge-connected to the lateral edges of said rearwall and adapted to lie in parallel abutting engagement with the sidewalls when the rear wall is in the upstanding latched position.

10. The invention defined in claim 7 wherein the front wall and the rearwall each include a pair of said container-centering cam members.

11. The invention defined in claim 7 including forklift receivingopenings in at least one of said upstanding side walls.

1. A multiple functional land trailer comprising: A. a main trailerchassis frame; B. a rigid, self-supporting trailer body supporting frameremovably mounted on said main chassis frame; C. said main trailerchassis frame including: i. upstanding front and side walls defining anupwardly open trailer body supporting frame receiving bed; D. saidtrailer body supporting frame and said receiving bed of said maintrailer chassis frame respectively having shapes and dimensions tointerengage in mating nested relationship and with said receiving bedengaging and supporting said trailer body supporting frame inco-extensive intimate frame-to-frame supporting engagement therewith;and E. engaging and centering means on said chassis frame and saidtrailer body supporting frame for interengaging and securing saidtrailer body supporting frame to said receiving bed in an integrated andinterlocked relationship as a substantially unitized composite structureof combined structural support and rigidity.
 1. A multiple functionalland trailer comprising: A. a main trailer chassis frame; B. a rigid,self-supporting trailer body supporting frame removably mounted on saidmain chassis frame; C. said main trailer chassis frame including: i.upstanding front and side walls defining an upwardly open trailer bodysupporting frame receiving bed; D. said trailer body supporting frameand said receiving bed of said main trailer chassis frame respectivelyhaving shapes and dimensions to interengage in mating nestedrelationship and with said receiving bed engaging and supporting saidtrailer body supporting frame in co-extensive intimate frame-to-framesupporting engagement therewith; and E. engaging and centering means onsaid chassis frame and said trailer body supporting frame forinterengaging and securing said trailer body supporting frame to saidreceiving bed in an integrated and interlocked relationship as asubstantially unitized composite structure of combined structuralsupport and rigidity.
 2. The invention defined in claim 1 including atelescopic boom carried by the main frame and adapted to extendrearwardly of the rear end of said trailer, winch means secured to theforward end of said trailer and flexible draft means cooperating withthe removable container and said boom for urging the container from thetrailer chassis.
 3. The invention defined in claim 2 including a pulleymounted at the rearward end of said boom.
 4. The invention defined inclaim 1 including container removal facilitating means operativelycarried by the main frame and selectively attachable to the removablecontainer, said means being operable for urging the container from thetrailer chassis.
 5. A multiple functional land trailer as claimed inclaim 1, including support legs pivotally connected to each trailer bodyframe, said support legs being retractable and extensible, said supportlegs being retractable and securable within the confines of said trailerbody frame in a manner to prevent interference between the respectiveframes.
 6. A multiple functional land trailer comprising: A. a wheeledchassis; B. a trailer body; C. said chassis including a generallyquadrangular main frame and upstanding front and side walls defining atrailer body receiving bed to receive a rigid removable trailer body; D.said trailer body having a frame of size and shape corresponding to saidtrailer body receiving bed and removably nested and mating therein; E.said trailer body frame having apertures in at least one end wallthereof; F. engaging and centering cam members secured to an end wall ofsaid trailer body receiving bed and engageable in said apertures, saidcam members and said apertures coacting for securing said trailer bodyin said trailer body receiving bed and interengaging and securing saidframes in an integrated and interlocked relationship as a substantiallyunitized composite structure of combined structural support andrigidity.
 7. A multiple functional land trailer as claimed in claim 6,wherein the securing means include at least one trailer body engagingand centering cam member secured to said front wall and projectinggenerally rearwardly, a rearwardly foldable upstanding rear wall on saidchassis, at least one cam member carried by said rear wall, said trailerbody having a mating rear opening in the frame thereof, said latter cammember being engageable in said latter opening when said rear wall is inan upstanding position.
 8. The trailer defined in claim 7 wherein saidrear wall is hinged to the main frame along its lateral rear edge andlock means securing said rear wall to each of said upstanding sidewalls.
 9. The invention defined in claim 8 wherein said lock meansincludes a pair of arm members hinge-connected to the lateral edges ofsaid rear wall and adapted to lie in parallel abutting engagement withthe side walls when the rear wall is in the upstanding latched position.10. The invention defined in claim 7 wherein the front wall and the rearwall each include a pair of said container-centering cam members.